Bryant 764A Air Conditioner User Manual
Contents
1. 4 10 16 21 27 32 SUCTION LINE TEMPERATURE CO 90 Fig 22 Cooling Charging Chart 564A 764A042 I I I 758 110 OUTDOOR TEMP VTDOOR 689 100 ms 46 LLL 105 41 3 95 2621 90 H g 16 es 291 821 5552 80 65 18 E ss 134 g 45 7 2483 70 z 414 z60 i 3 bay 5345 50 uU 276 40 30 30 40 50 60 70 80 90 SUCTION LINE TEMPERATURE CF E 4 10 16 21 27 32 SUCTION LINE TEMPERATURE C Fig 23 Cooling Charging Chart 564A 764A048 18 758 1101111 INN NR LL Coco 689 100 _ OUTDOOR TEMP a 2621 0 HH wo 5 g 29 HH 552 BO H e E HH 483 70 Eo B 414 260 m 3 e 5 H d 5 345 50 uU 276 40 Coo 30 Co 30 40 50 60 70 80 90 SUCTION LINE TEMPERATURE F 4 10 16 21 27 32 SUCTION LINE TEMPER2. 16 VI Metering Device Servicing 16 Vil Liquid Line Strainer 16 Vill Refrigerant 16 IX Replacement 16 COOLING TROUBLESHOOTING CHART 19 START UP CL 1 SAFETY CONSIDERATIONS N WARNING I mproper installation adjustment alter ation service maintenance or use can cause explo sion fire electric shock or other occurrences which may injure you or damage your property Consult a quali fied installer or service agency for information or assis tance The qualified installer or agency must use only factory authorized kits or accessories when modifying this product Recognize safety information This is the safety alert symbol A When you see this symbol on the unit and in instruc tions or manuals be alert to the potential for personal injury Understand the signal words DANGER WARNING and CAUTION These words are used with the safety alert 564A Sizes 024 060 764A Sizes 024 060 Cancels 564A 24 1 564A 24 2 6 1 96 NN AU AI AKIN LLL MI N NN AKI AAC LLL AK A AKI Fig 1 Unit 564A and 764A Size 036 Shown symbol A Danger identifies the most serious hazards which will result in severe personal injury o
3. 85F Suction Pressure 80 psig Suction Temperature should be 70 F Suction Temperature may vary 5 If Chargemaster charging device is used temperature and pressure readings must be accomplished using the charging chart IX REPLACEMENT PARTS A complete list of replacement parts may be obtained from your distributor upon request 16 758 110 684 10 OUTDOOR TEMP 115 46 n 2621 90 105 41 amp la 95 35 e 85 29 5 amp 2552 BO 75 24 5 B 65 18 P 483 70 55 13 45 2 414 260 5 5 5 5345 50 SA t 276 40 30 30 40 50 60 70 80 90 SUCTION LINE TEMPERATURE F Fig 19 Cooling Charging Chart 564A 764A024 4 10 16 21 SUCTION LINE TEMPERATURE C 32 SUCTION LINE TEMPERATURE C gt ET 758 11
4. 762 0 30 00 Power Entry Side E Except for NEC Requirements 762 0 30 00 WIP TOP ee Pe Se a 914 0 36 00 Side Opposite Ducts 762 0 30 00 NOTES 1 Clearances must be maintained to prevent recirculation o air from condenser fan discharge With the exception of the condenser coil 914 mm 36 in a removable fence or bar ricade requires no clearance 2 Dimensions in millimeters Dimensions in are in inches 14 0 DUCT OPENINGS REAR VIEW 1295 0 4 50 981 BOTTOM OF UNIT BLOWER CONTROL BOX AND EVAPORATOR COIL ACCESS PANEL CONDENSER COIL 812 5 31 991 BOTTOM OF UNIT COMPRESSOR PANEL FIELD ENTRY TO 69 0 549 0 21 611 SERVICE PORTS 22 2 DIA o 0 88 LOW VOLTAGE ENTRY 165 4 ens 44 5 DIA 130 13 125 601 POWER ENTRY 30 6 11 201 498 1 63 5 20 5 1 5 19 611 2 501 11 0461 CONDENSATE DRAIN LEFT SIDE VIEW FRONT VIEW RIGHT SIDE VIEW Fig 3 Base Unit Dimensions 564A 764A042 048 cut ELECTRICAL 564A 764A CHARACTERISTICS WEM CENTER OF GRAVITY mm in x v z o ee 355 6 14 00 508 0 20 00 355 6 14 00 117 6 4 63 REAR VIEW 1295 0 BOTTOM 150 981 812 5 31 99 COMPRESSOR PANEL FIELD ENTRY TO SERVICE PORT
5. Units are dedicated side supply products Units not con vertible to vertical air supply A field supplied plenum must be used to convert to vertical air discharge D Electrical Connections NWARNING The unit cabinet must have an un interrupted unbroken electrical ground to minimizethe possibility of personal injury if an electrical fault should occur This ground may consist of an electrical wire con nected to the unit ground in the control compartment or conduit approved for electrical ground when installed in accordance with NEC ANSI American National Standards Institute NFPA latest edition in Canada Canadian Electrical Code CSA Canadian Standards Association C22 1 and local electrical codes Failure to adhere to this warning could result in per sonal injury or death A CAUTION Failure to follow these precautions could result in damage to the unit being installed 1 Make all electrical connections in accordance with ANSI NFPA latest edition and local electrical codes governing such wiring In Canada all elec trical connections must be in accordance with CSA Standard C22 1 Canadian Electrical Code Part 1 and applicable local codes Refer to unit wiring diagram Use only copper conductor for connections between field supplied electrical disconnect switch and unit DO NOT USE ALUMINUM WIRE Besurethat high voltage power to unit is within op erating voltage range indicated on unit rating pl
6. CONDENSER COIL Rows Fins in Total Face Area sq ft CONDENSER FAN MOTOR Nominal Rpm Motor Hp Diameter in EVAPORATOR COIL Rows Fins in Total Face Area sq ft EVAPORATOR FAN MOTOR Blower Motor Size in Nominal Rpm Range Number of Speeds Factory Speed Setting Motor Hp CONNECTING DUCT SIZES Supply Air in Return Air in FIELD SUPPLIED RETURN AIR FILTERT Throwaway in 460 v motors are 2 speed only 1 417 7 9 14 14 24 x 24 24 x 24 24 x 24 24 x 24 24 x 30 Direct Drive 10x9 1400 10x8 1200 10x9 1600 1000 1100 2 13 9 x 27 8 24 x 30 TRequired filter sizes shown are based on the ARI Air Conditioning and Refrigeration Institute rated airflow at a velocity of 300 ft min for throwaway type or 450 ft min for high capacity type Recommended filters are 1 in thick CONDENSATE DRAIN HOLE Fig 7 Condensate Connection Details 1 MIN EE 2 MIN BEER Fig 8A Condensate Trap Using Tubing TRAP OUTLET Fig 8B Condensate Trap Using PVC Piping If the installation requires draining the condensate water away from the unit install a field supplied 2 in trap using a in OD tubing or piping to ensure proper drainage See Fig 8A and 8B Make sure that the outlet of the trap is at least one in lower than the unit drain pan condensate con nection to prevent the pan from overflowing Connect a drain tube using a minimum of in
7. Condenser Fan Adjustment 15 IV ELECTRICAL CONTROLS AND WIRING Inspect and check the electrical controls and wiring an nually Besureto turn off all electrical power to theunit Remove the control evaporator fan and compressor compart ment access panels to locate all the electrical controls and wiring Check all electrical connections for tightness Tighten all screw connections If any smoky or burned connections are noticed disassemble the connection and dean all the parts Then restrip the wire end and reassemble the connection prop erly and securely After inspecting the electrical controls and wiring replace all the panels Start the unit and observe at least one complete heating cyde if accessory electric heaters are field installed in unit and one complete cooling cycle to ensure proper operation If discrepancies are observed in either or both operating cycles or if a suspected malfunction has occurred check each electrical component with the proper electrical instrumentation Refer to unit wiring label when performing these checkouts NOTE Refer to the Cooling Sequence of Operation on page 13 as an aid in determining proper control operation V INDOOR AIRFLOW The airflow does not require checking unless improper per formance is suspected If a problem exists be sure that all supply and return air grilles are open and freefrom obstruc tions and that the air filter is dean When necessary refer t
8. External Static Pressure Indoor Evaporator Fan Motor Unit is factory set on medium speed this airflow is not obtainable at low speed TSize 048 has low and high speed only 460 volt motors do not have a medium speed NOTE Values for 208 230 v motors are at 230 v deduct 10 for 208 v For 208 230 v Blower Motors The motor leads are color coded as follows 3 SPEED 2 SPEED black high speed black high speed blue medium speed red low speed red low speed To change the speed of the blower motor remove the fan mo tor speed leg lead from the indoor evaporator fan relay IFR and replace with lead for desired blower motor speed Insu late the removed lead to avoid contact with chassis parts B For 460 v 2 Speed Blower Motors The motor leads are color coded as follows black high yellow jumper purple jumper red low To change the speed of the blower motor from low speed to high speed remove the red lead from the indoor fan relay IFR Insulate the red lead to avoid contact with any chassis parts Separate the black lead from the purple jumper Con nect the black lead to the IFR Insulate the purple lead to avoid contact with any chassis parts aes be ae CARE AND MAINTENANCE NOTE The following steps should be performed by a quali fied service person A WARNING Before installing or servicing unit turn off main power to system to avoid shock hazard or in jury from rotating
9. PVC in CPVC or Y in copper pipe all field supplied Do not undersizethetube Pitch the drain tube downward at a slope of at least 1inch in every 10 ft of horizontal run Be sure to check the drain tube for leaks Prime trap at the beginning of cooling season start up Allowable glues for condensate trap connection are Stand ard ABS CPVC or PVC cement B Field Duct Connections NOTE The design and installation of the duct system must be in accordance with the standards of NFPA for the instal lation of nonresidence type air conditioning and ventilating systems NFPA 90A or residence type NFPA 90B and or local codes and ordinances Units have duct flanges on the supply and return air open ings on the side of the unit See Fig 2 4 for connection sizes and locations Install Flanges for Ductwork Connections 564 764 060 only The size 060 units are shipped with flanges which must be field installed on the unit 4 Install 2 hand formed flanges onto return air opening in holes provided to form rectangle around the return air opening To install unit flanges 5 Install remaining 2 hand formed flanges around dis charge air opening in holes provided 1 Five pieces of flange are shipped on the return air open ing of the unit Remove the flanges from the shipping 6 Ductwork can now be attached to flanges position are e bU ple Adhere to the following criteria when selecting sizing
10. Table 1 Refer to Carrier Refrigerant Service Tech niques Manual Refrigerants section Unit panels must be in place when unit is operating during charging procedure No Charge Use standard evacuating techniques After evacuating system weigh in the specified amount of refrigerant refer to Table 1 Low Charge Cooling Use Cooling Charging Charts Fig 19 24 Vary refrigerant un til the conditions of the appropriate chart are met Note that charging charts are different from the type normally used Charts are based on charging the units to the correct super heat for the various operating conditions Accurate pressure gage and temperature sensing device are required To measure suction pressure perform the following 1 Connect the pressure gage to the service port on the suc tion line 2 Mount the temperature sensing device on the suction line and insulate it so that outdoor ambient tempera ture does not affect the reading ndoor air cfm must be within the normal operating range of the unit To Use Cooling Charging Charts 1 Takethe outdoor ambient temperature and read the suc tion pressure gage 2 Refer to appropriate chart to determine what the suc tion temperature should be 3 If suction temperature is high add refrigerant If suc tion temperature is low carefully recover some of the charge 4 Recheck the suction pressure as charge is adjusted EXAMPLE Fig 19 Outdoor Temperature
11. connect the leads to the black yellow and blue wires see Fig 15 Connecting Ground Lead to Unit Ground Refer to Fig 14 and 15 Connect the ground lead to the chas sis using the unit ground screw in the control box Routing Control Power Wires Form a drip loop with the thermostat leads before routing them into the unit Route the thermostat leads through grommeted hole provided in unit see Fig 13 into unit con trol box Connect thermostat leads to unit control power leads as shown in Fig 16 Route thermostat wires through grommet providing a drip loop at the panel Connect low voltage leads to the thermo stat as shown in Fig 16 The unit transformer supplies 24 v power for complete system including accessory electrical heater Transformer is factory wired for 230 v operation If supply voltage is 208 v HIGH VOLTAGE LOW VOLTAGE POWER WIRING WIRING ENTRY ENTRY HOLE HOLE Fig 13 Unit Electrical Connection Entry Holes COMPRESSOR CONTACTOR TRANSFORMER Nm S E 9 y 9 OP ELECTRIC GROUND LUG INDOOR OUTDOOR FAN MOTOR HEATER FAN RELAY AND COMPRESSOR FUSES START CAPACITOR Fig 14 Control Box Wiring rewire transformer primary as described in Special Proce dures for 208 V Operation section on page 11 Accessory Electric Heat Wiring Refer to accessory electric heat install
12. millimeters Dimensions in are in inches REAR VIEW 1295 0 BOTTOM 150 98 EVAP COIL Y COND COIL BOTTOM li CONTROL BOX AND EVAP COIL ACCESS PANEL COMPRESSOR PANEL 69 0 549 0 FIELD ENTRY T nad SERVICE PORTS teare EN 44 5 DIA 22 2 DIA 1 75 10 88 POWER ENTRY LOW VOLTAGE ENTRY 9 441 0 17 60 30 6 11 20 498 1 He 63 5 19 611 12 501 LEFT SIDE VIEW FRONT VIEW CORDENSATERDRAIN RIGHT SIDE VIEW Fig 2 Base Unit Dimensions 564A 764A024 036 UNIT LEGEND UNIT ELECTRICAL WEIGHT CENTER OF GRAVITY mm in NEC National Electrical Code CATA CHARACTERISTICS lib Kg x J v gt REQUIRED CLEARANCES TO COMBUSTIBLE 042 208 230 1 60 208 230 3 60 355 6 14 00 508 0 20 00 304 8 12 00 To run mm ing 208 230 1 60 208 230 3 60 310 355 6 14 00 508 0 20 00 304 8 12 00 Duct Side of Unit 222 22 0 Side Opposite Ducts 5 2 duco RR Ee 0 Bolo or Unit Na Sik eA wir EE Der A 0 NEC REQUIRED CLEARANCES mm in Between Units Power Entry Side 1066 8 42 00 Unit and Ungrounded Surfaces Power Entry Side 914 0 36 00 Unit and Block or Concrete Walls and Other i Grounded Surfaces Power Entry Side 1066 8 42 00 REQUIRED CLEARANCES FOR SERVICING mm in Condenser Coil Access
13. parts There may be more than one disconnect switch Turn off accessory heater power if ap plicable Electrical shock can cause personal injury or death Toensure continuing high performance and to reduce the pos sibility of premature equipment failure periodic main tenance must be performed on this equipment Unit should be inspected at least once each year by a qualified service person NOTE TO EQUIPMENT OWNER Consult your local dealer about the availability of a maintenance contract A WARNING The ability to properly perform mainte nance on this equipment requires certain expertise mechanical skills tools and equipment If you do not possess these do not attempt to perform any mainte nance on this equipment other than those procedures recommended in the User s Manual FAILURE TO HEED THIS WARNING COULD RESULT IN SERIOUS PER SONAL INJ URY AND POSSIBLE DAMAGE TO THIS EQUIPMENT The minimum maintenance requirements for this equipment are as follows 1 Inspect air filter s each month Clean or replace when necessary 2 Inspect condensing coil drain pan and condensate drain each cooling season for cleanliness Clean when necessary 3 Inspect evaporator fan motor and wheel for cleanliness each heating and cooling season Clean when necessary For first heating season inspect evaporator fan motor bimonthly to determine proper cleaning frequency 4 Check electrical connections for tightness and controls for prop
14. person A WARNING Before installing or servicing unit turn off main power to system to avoid shock hazard or in jury from rotating parts There may be more than one disconnect switch Turn off accessory heater power if applicable Electrical shock can cause personal injury or death CLEANING Inspect unit interior at the beginning of each heating and cool ing season or as operating conditions require To inspect and clean the unit top must be removed A Unit Top Removal NOTE When performing maintenance or service procedures that require removal of the unit top be sureto perform all of the routine maintenance procedures that require top re moval including coil inspection and cleaning and conden sate drain pan inspection and deaning Only qualified service personnel should perform mainte nance and service procedures that require unit top removal Refer to the following top removal procedures 1 Remove 7 screws on unit top cover surface Save all screws 2 Remove 2 screws that secure unit top cover flange Save all screws 3 Lift top from unit carefully Set top on edge and ensure that top is supported by unit side that is opposite duct side When maintenance and or service procedures are concluded carefully replace and secure unit top to unit using screws re moved in Steps 1 and 2 B Repairing Refrigerant Leaks Proceed as follows to repair a refrigerant leak and to charge the unit 1 Locate leak and ens
15. 0 OUTDOOR TEMP 689 100 7 50 115 46 E 105 41 Uu z 621 2 os 35 2 85 29 5 e 75 24 552 BO 65 18 x 5 55 13 8 483 70 PME 2 y 9 ara 260 E 5 t N 5 345 50 2 ji 276 40 30 30 40 50 60 70 80 30 SUCTION LINE TEMPERATURE 4 10 16 21 27 32 Fig 20 Cooling Charging Chart 564A 764A030 758 110 589 100 OUTDOOR TEMP A SE 115 46 5 105 41 26211 90 5 3 95 35 H H amp 2 85 29 z 2 d 75 24 T 8 SS 13 a LL ib 483 270 EC 9 z 541 4 560 5345 50 pas N E 276 40 30 30 40 50 60 70 80 90 SUCTION LINE TEMPERATURE 4 10 16 21 27 32 SUCTION LINE TEMPERATURE C Fig 21 Cooling Charging Chart 564A 764A036 758 110 689 100 621 o Ey PSIG y 552 o 483 N e SUCTION LINE PRESSURI SUCTION LINE PRESSURE KILOPASCALS 276 40 40 50 60 70 SUCTION LINE TEMPERATURE
16. ATURE C Fig 24 Cooling Charging Chart 564A 764A060 COOLING TROUBLESHOOTING CHART SYMPTOM CAUSE REMEDY Compressor and Call power company cane fan will not Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker Defective thermostat contactor transformer Replace component or control relay Insufficient line voltage Determine cause and correct Incorrect or faulty wiring Check wiring diagram and rewire correctly Thermostat setting too high Lower thermostat setting below room temperature Compressor will not Faulty wiring or loose connections in Check wiring and repair or replace start but condenser compressor circuit fan runs Compressor motor burned out seized or Determine cause Replace compressor internal overload open Defective run start capacitor overload or Determine cause and replace start relay One leg of 3 phase power dead Replace fuse or reset circuit breaker Determine cause Compressor cycles Refrigerant overcharge or undercharge Recover refrigerant evacuate system and recharge other than normally to capacities shown on nameplate Satisfying thermostat Defective compressor Replace and determine cause Insufficient line voltage Determine cause and correct Blocked condenser Determine cause and correct Defective run start capacitor overload Determine cause and replace or start relay Defective thermostat Replace thermostat Faulty condenser fan motor or capacitor R
17. Be sure that connections are completed and tight d Inspect coil fins If damaged during shipping and han dling carefully straighten fins with a fin comb 4 Verify the following conditions a Make sure that condenser fan blade is correctly po sitioned in fan orifice Top edge of blade should be 3 125 in from condenser outlet grille b Make sure that air filter s is in place c Make sure that condensate drain pan and trap are filled with water to ensure proper drainage d Makesurethat all tools and miscellaneous loose parts have been removed 5 Compressors are internally spring mounted Do not loosen or remove compressor holddown bolts 6 Each unit system has 2 Schrader type ports one low side Schrader fitting located on the suction line and one high side Schrader fitting located on the compressor dis charge line Be sure that caps on the ports are tight See Start U p Checklist in back of book Unit is now ready for initial start up START UP 1 HEATING SECTION START UP AND ADJUSTMENTS For units with accessory electric heaters A CAUTION Complete the required procedures given in Pre Start U p section on this page before starting unit Do not jumper any safety devices when operating the unit A Checking Heating Control Operation Start and check the unit for proper heating control operation as follows 1 Turn on unit electrical supply 2 Set system switch selector at HEAT position and fan s
18. IGHT SIDE VIEW 25 4 1 00 1 046 CONDENSATE DRAIN Fig 4 Base Unit Dimensions 564A 764A060 LOCATE THE UNIT A Clearance Provide sufficient space for condenser airflow clearance wir ing and servicing unit See Fig 2 4 Locate unit where supply and return air ducts can be conveniently brought out to unit duct connections Unit may be placed with duct side as close to building as top removal duct connections and power connec tions permit Position unit so water or ice from roof does not drop directly on top of unit or in front of coil Make pro visions for condensate drainage Maintain a 4 ft clearance above unit for vertical air discharge Roof installation method for units depends on building con struction and special requirements of local building codes Be sure that roof can support unit weight Maintain clearance around and above unit to provide proper airflow and service access See Fig 2 4 CAUTION Do not restrict condenser airflow An air restriction at either the condenser air inlet the entire surface of the condenser coil or the fan discharge can be detrimental to compressor life The condenser fan discharges through the top of the unit Ensure that the fan discharge does not recirculate to the con denser coil Do not locate the unit either in a corner or under a complete overhead obstruction and ensure the following dear ances are provided On roof overhangs provide a minimum
19. S BOTTOM LEGEND NEC National Electrical Code REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL mm in JOD Of Unit ei d eod Se een 0 Duet Side of Unit 4 452 u we sw an sea Bananen 0 Side Opposite Ducts 0 Bottom of 4 2 cet e AE 0 NEC REQUIRED CLEARANCES mm in Between Units Power Entry Side Unit and Ungrounded Surfaces Power Entry Side Unit and Block or Concrete Walls and Other Grounded Surfaces Power Entry Side 1066 8 42 00 REQUIRED CLEARANCES FOR SERVICING mm in Condenser Coil Access Side 762 0 30 00 Power Entry Side Except for NEC Requirements 1066 8 42 00 914 0 36 00 762 0 30 00 Unit TOP fru e 914 0 36 00 Side Opposite 762 0 30 00 NOTES 1 Clearances must be maintained to prevent recirculation of air from condenser fan discharge With the exception of the condenser coil 914 mm 36 in a removable fence or bar ricade requires no clearance 2 Dimensions are in millimeters Dimensions in are in inches er CONTROL BOX AND EVAP COIL ACCESS PANEL 69 0 549 0 2 721 21 611 4 5 DIA 22 2 DIA 11750 0 88 POWER ENTRY LOW VOLTAGE ENTRY 151 8 29 60 LEFT SIDE VIEW FRONT VIEW 30 6 1 20 26 57 1 0 498 1 119611 R
20. amiliarization Maintenance e Installation Overview Operating Sequence A large selection of product theory and skills programs is available All programs include a video cassette and or slides and a companion booklet Use these for self teaching or to conduct full training sessions For a free Service Training Material Catalog STM call 1 800 962 9212 Ordering instructions are induded Copyright 1996 Carrier Corporation CATALOG NO BDP 3356 403 START UP CHECKLIST Remove and Store in Job File PRELIMINARY INFORMATION MODEL NO ___ SERIAL NO DATE TECHNICIAN Il PRE START UP insert checkmark in box as each item is completed VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS VERIFY THAT UNIT INSTALLATION IS LEVEL CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING ORIFICE AND SETSCREW TIGHTNESS Ill START UP ELECTRICAL SUPPLY VOLTAGE 1112 12 13 13 11 COMPRESSOR AMPS 11 L2 L3 EVAPORATOR FAN AMPS TEMPERATURES OUTDOOR AIR TEMPERATURE DB RETURN AIR TEMPERATURE DB WB PRESSURES REFRIGERANT SUCTION PSIG REFRIGERANT DISCHARGE PSIG VERIFY REFRIGERANT CHARGE USING CHARGING TABLES Copyright 1996 Carrier Corporation CL 1 CATALOG NO BDP 3356 403 CUT ALONG DOTTED LINE CUT ALONG DOTTED LINE
21. an the coils with a mild detergent and water solution Rinse coils with clear water using a garden hose Be careful not to splash water on motors insulation wiring or air filter s For best results spray condenser coil fins from inside to outside theunit On units with an outer and inner condenser coil be sure to clean between the coils Be sure to flush all dirt and debris from the unit base Inspect the drain pan and condensate drain line when inspecting the coils Clean the drain pan and condensate drain by removing all foreign matter from the pan Flush the pan and drain tube with dear water Do not splash water on the insulation motor wiring or air filter s If the drain tube is restricted dear it with a plumbers snake or similar probe device Ensure that the auxiliary drain port above the drain tube is also dear Il EVAPORATOR FAN AND MOTOR Refer to Care and Maintenance section for procedure IIl CONDENSER FAN A CAUTION Keep the condenser fan free from all obstructions to ensure proper cooling operation N ever place articles on top of the unit Damage to unit may result 1 Shut off unit power supply Remove condenser fan assembly grille motor motor cover and fan by removing screws and flipping assembly onto unit top cover Loosen fan hub setscrews Adjust fan height as shown in Fig 18 Tighten setscrews Replace condenser fan assembly N Ou 3 125 in Fig 18
22. and 2 One piece of flange is used as it is shipped straight installing the duct system Bend theother 4 pieces at right angles 1 Select and size ductwork supply air registers and return 3 Install the straight flange on the right side of the air grilles according to ASHRAE American Society of turn air opening in holes provided See Fig 10 Flanges Heating Refrigeration and Air Conditioning Engi should stick out from unit to allow for connection of neers recommendations ductwork NCAUTION When drilling the duct system fastening holes into the side of the unit for duct flanges do not drill deeper than 34 in and use extreme care not to puncture the coil or coil tubes See Fig 11 2 Useflexible transition between rigid ductwork and unit to prevent transmission of vibration Thetransition may be screwed or bolted to duct flanges Use suitable gas kets to ensure weathertight and airtight seal 19 17 3 92 As TUN NIMM FIVE PIECES OF DUCT MN FLANGE ATTACHED HERE FOR SHIPMENT Fig 9 Shipping Location of Duct Flanges Size 060 Only M WM AMA m UN i AU y IN y Fig 11 Area Not To Be Drilled More Than in 3 Size ductwork for cooling air quantity cfm Adequately insulate and weatherproof all ductwork located outdoors Insulate ducts
23. ate On 3 phase units ensure that phases are balanced within 296 Consult local power company for tion of improper voltage and or phase imbalance Insulate low voltage wires for highest voltage con tained within conduit when low voltage control wires are run in same conduit as high voltage wires Do not damage internal components when drilling through any panel to mount electrical hardware con duit etc High Voltage Connections Theunit must have a separate electrical service with a field supplied waterproof disconnect switch mounted at or within sight from the unit Refer to the unit rating plate for maxi mum fuse circuit breaker size and minimum circuit amps ampacity for wire sizing See Table 2 for electrical data Thefield supplied disconnect may be mounted on the unit over the high voltage inlet hole See Fig 2 4 A CAUTION Operation of unit on improper line volt age constitutes abuse and may cause unit damage that could affect warranty Routing Power Leads Into Unit Use only copper wire between disconnect and unit The high voltage leads should bein a conduit until they enter the unit conduit termination at the unit must be watertight Run the high voltage leads through the hole on the side of the unit see Fig 13 for location When the leads are inside the unit run leads to the control box Fig 14 For single phase units connect leads to the black and yellow wires for 3 phase units
24. ation instructions for information on installing accessory electric heat Accessory electric heat wiring is shown in Fig 17 UNIT GROUND SCREW IN CONTROL BOX GROUND LEAD T SINGLE PHASE 11 3 PHASE CONNECTIONS CONNECTIONS TO DISCONNECT TODISCONNECT R PER Ben LEGEND NEC National Electrical Code Field Control Wiring Field Splice rm Fig 15 Line Power Connections UNIT CONTROL POWER SPLICE BOX THERMOSTAT AND SUBBASE Fig 16 Control Connections Table 2 Electrical Data VOLTAGE UNIT VOLTAGE RANGE IIR e epea na woe m 2 4 208 230 1 60 208 230 1 60 208 230 1 60 208 230 3 60 208 230 1 60 z a N N i a ES e a gt 16 9 16 9 20 20 16 16 3 8 5 0 18 1 20 8 25 6 29 0 30 30 24 27 7 5 10 0 36 1 41 7 48 1 55 1 50 60 44 51 30 30 18 1 20 8 30 30 36 1 41 7 50 60 54 2 62 5 E 80 901 30 30 18 1 20 8 30 30 36 1 41 7 50 60 54 2 62 5 1 80 901 72 2 83 3 100 110 10 4 12 0 20 8 24 1 31 3 36 1 41 7 48 1 18 1 20 8 36 1 41 7 54 2 62 5 72 2 83 3 10 4 12 0 20 8 24 1 31 3 36 1 15 0 20 0 41 7 48 1 55 6 LEGEND o N f 9 d 208 230 3 60 208 230 1 60 FLA Full Load Amps HACR Heating Air Conditioning and Refrigeration IFM Indoo
25. clearance of 48 in above the top of the unit for partial overhangs such as a normal house roof overhang If there is a horizontal exten sion on the partial overhang extension must not exceed 48 inches F or extended overhangs provide a minimum clear ance of 36 in between unit and overhang Provide a minimum clearance of 42 in for the control box side next to a block wall or any other grounded surface Pro vide a minimum clearance of 36 in between the control box side of the unit and any electrically live parts Unit may be installed on wood flooring or on Class A B or C roof covering materials Although unit is weatherproof guard against water from higher level runoff and overhangs Units should be at least 4 in above the highest expected wa ter flood and runoff levels Do not usethe unit if it has been under water B Ground Level Installation Mount unit on a solid level pad SeeFig 5 for unit leveling tolerances Construct pad as shown in Fig 6 Sideof unit with condensate trap should be flush with pad for proper trap po sitioning see Fig 2 4 Extend a 24 in gravel apron around pad for condensate drainage Il RIG AND PLACE UNIT Inspect unit for transportation damage File any claim with transportation agency Keep upright and do not drop Level by using unit frame as a reference See Table 1 for additional information Weight is shown in Fig 2 4 Unit can be moved with handholds provided in the unit ba
26. d inter mittently thermostat FAN switch in AUTO position or every 2 years if the motor is used continuously thermostat FAN switch in ON position A WARNING Disconnect and tag all electrical power to the unit before cleaning the evaporator fan and wheel Failureto adhere to this warning could cause personal injury or death To dean the blower wheel 1 Access the blower assembly as follows a Remove top access panel b Remove screws that hold blower orifice ring to blower housing Save screws Loosen set screw s which secure wheel to motor shaft 2 Remove and clean blower wheel as follows a Lift wheel from housing When handling and or clean ing blower wheel be sure not to disturb balance weights dips on blower wheel vanes b Remove caked on dirt from wheel and housing with a brush Remove lint and or dirt accumulations from wheel and housing with vacuum cleaner using a soft brush attachment Remove grease and oil with a mild solvent c Reassemble blower into housing Place upper orifice ring on blower to judge location of the blower wheel Blower wheel should be approximately 2 in below bottom of orifice ring when centered correctly Besure set screws aretightened on motor and arenot on round part of shaft d Set upper orifice ring in place with screws removed in Step 1 e Replace top access panel 14 SERVICE NOTE Thefollowing steps should be performed by a quali fied service
27. deviation from average voltage AB 457 452 5 BC 464 457 7 v 457 455 22v Maximum deviation is 7 Determine percentage of voltage imbalance 9 i ais Voltage imbalance 100 x 257 1 53 This amount of phase imbalance is satisfactory as it is below the maximum allowable 2 IMPORTANT If the supply voltage phase imbalance is more than 2 contact your local electric utility company immediately ma _ COMMON _ m Le ___ MT 1 _ __ TO UNIT POWER WRING Fig 17 Electric Heater Wiring Special Procedures for 208 V Operation A WARNING Make sure that the power supply to the unit is switched OFF before making any wiring changes Electrical shock can cause personal injury or death 1 Disconnec the orange transformer primary lead from the contactor See unit wiring label 2 Removethe wirenut from the terminal on the end of the red transformer primary lead Savethe wirenut 4 Connect the red lead tothe contactor terminal from which the orange lead was disconnected 5 Using the wirenut removed from the red lead insulate the loose terminal on the orange lead 6 Wrap the wirenut with electrical tape so that the metal terminal cannot be seen w Indoor blower motor speeds may need to be changed for 208 operation Refer to Indoor Airflow and Airflow Adjustments section on page 13 Heat Anticipator Setting The room thermostat heat antici
28. em contains oil and refrigerant under pressure To re move a component wear protective goggles and pro ceed as follows a Turn off electrical power to unit b Relieve and reclaim all pressure from system Cut component connecting tubi ng with tubing cut ter and remove component from unit d Carefully unsweat remaining tubing stubs when necessary Oil can ignite when exposed to torch flame For unit compressors equipped with accessory crankcase heat ers heaters are energized as long as there is power to the unit Energize crankcase heater 24 hours prior to unit start up To energize heater only set thermostat at OFF position and turn on unit main power at disconnect switch Te Proceed as follows to inspect and prepare the unit for initial start up 1 Remove all access panels 2 Read and follow instructions on all WARNING CAU TION and INFORMATION labels attached to or shipped with unit 3 Make the following inspections a Inspec for shipping and handling damages such as broken lines loose parts disconnected wires etc b Inspect for oil at all refrigerant tubing connections and on unit base Detecting oil generally indicates a refrigerant leak Leak test all refrigerant tubing con nections using electronic leak detector halide torch or liquid soap solution If refrigerant leak is de tected see Repairing Refrigerant Leaks section on page 15 c Inspect all field and factory wiring connections
29. er operation each heating and cooling season Service when necessary 5 Check the drain channel in the top cover periodically for blockage leaves insects Clean as needed N WARNING F ailure to follow these warnings could re sult in serious personal injury 1 Turn off all electrical power to the unit before per forming any maintenance or service on the unit 2 Useextreme caution when removing panels and parts As with any mechanical equipment personal injury can result from sharp edges etc 3 Never place anything combustible either on or in con tac with the unit 4 Should overheating occur shut off all of the electri cal supply s AIR FILTER A CAUTION Never operate the unit without a suit able air filter in the return air duct system Always re place the filter with the same dimensional size and type as originally installed See Tables 1 and 2 for recom mended filter sizes Inspect air filter s at least once each month and replace throwaway type or clean permanent type at least twice dur ing each cooling season or whenever the filter s becomes dogged with dust and lint Il EVAPORATOR FAN AND MOTOR NOTE Motors without oilers are permanently lubricated Do not attempt to lubricate these motors For longer life operating economy and continued efficiency dean accumulated dirt and grease from the evaporator fan wheel and motor annually Lubricate the motor every 5 years if the motor is use
30. estriction in refrigerant system Locate restriction and remove Compressor operates Dirty air filter Replace filter continuously Unit undersized for load Decrease load or increase unit size Thermostat set too low Reset thermostat Low refrigerant charge Locate leak repair and recharge Leaking valves compressor Replace compressor Air in system Recover refrigerant evacuate system and recharge 3 1 Condenser coil dirty or restricted Clean coil or remove restriction Excessive head Dirty air filter Replace filter Dirty condenser coil Clean coil Refrigerant overcharged Recover excess refrigerant Air in system Recover refrigerant evacuate system and recharge Condenser air restricted or air short cycling Determine cause and correct Head pressure too low Low refrigerant charge Check for leaks repair and recharge Excessive suction DEUS Suction pressure too e Metering device or low side restricted Remove source of restriction Insufficient evaporator airflow Increase air quantity Check filter and replace if necessary Temperature too low in conditioned area Reset thermostat Outdoor ambient below 40 F Install low ambient kit Fielc installed fiter drie restricted 19 PACKAGED SERVICE TRAINING Our packaged service training programs provide an excellent way to increase your knowledge of the equipment discussed in this manual Product programs cover Unit F
31. installation start up and service instructions PACKAGED AIR CONDITIONERS IMPORTANT READ BEFORE INSTALLING 1 Read and become familiar with these installation in structions before installing this unit Fig 1 Retain these instructions for future maintenance and repair 2 Besure the installation conforms to all applicable local and national codes Wear safety glasses and work gloves Use quenching cloth for unbrazing operations Have fire extinguisher available for all brazing operations CONTENTS Page SAFETY CONSIDERATIONS 1 INSTALLATION 4 24 e mee mese ena 1 11 1 Locate the Unit 5 Il Rig and Place 5 Ill Unit Duct and Field Connections 5 PRE START UP 11 12 START UP hs hottie Wek ici id eee asien 12 13 Heating Section Start Up and Adjustments 12 Il Cooling Section Start Up and Adjustments 12 Indoor Airflow and Airflow Adjustments 13 CARE AND MAINTENANCE 14 A Filter inrer eret Print 14 1 Evaporator Fan and Motor 14 SERVICE 5 al en deep PRU ac 15 18 l Cleaning 15 1 Evaporator Fan and Motor 15 Condenser Fan 15 IV Electrical Controls and Wiring 16 V Indoor Airflow
32. o Indoor Airflow and Airflow Adjustments section on page 13 to check the system airflow VI METERING DEVICE SERVICING Refrigerant metering devices are fixed orifices and are lo cated in the inlet header to the evaporator coil Vil LIQUID LINE STRAINER Strainer is made of wire mesh and is located in the liquid line on inlet side Remove strainer by cutting it from the liq uid line Braze a new strainer into liquid line with nitrogen gas flowing through the refrigerant system Vill REFRIGERANT CHARGE AN WARNING Avoid contact with hot gas discharge line to prevent a burn when working on compressor A CAUTION To prevent personal injury wear safety glasses and gloves when handling refrigerant Do not overcharge system An overcharge can cause com pressor damage Unit refrigerant system is factory charged When recharging is necessary weigh total charge indicated on unit name plate Remove and recover any refrigerant remaining in system before recharging If system has lost complete charge evacuate system to 500 microns 29 90 in Hg vacuum be fore recharging Schrader fitting connections are provided on unit sucion and discharge lines for evacuation and charg ing Dial a Charge charging cylinder is an accurate device used to charge systems by weight these cylinders are available at refrigeration supply firms A Adjusting Refrigerant Charge Amount of refrigerant chargeis listed on unit nameplate also refer to
33. o not operate the compressor when the outdoor tem perature is below 40 F unless accessory low ambient kit is installed Do not rapid cyde the compressor A Checking Cooling Control Operation Start and check the unit for proper cooling control operation as follows 1 Place room thermostat SYSTEM switch in OFF posi tion Observethat evaporator fan motor starts when FAN switch is placed in ON position and shuts down after a 30 second time delay when FAN switch is placed in AUTO position 2 PlaceSYSTEM switch in COOL position and FAN switch in AUTO position Set cooling control below room tem perature Observe that compressor condenser fan and evaporator fan motors start Observe that cooling cyde shuts down when control settingis satisfied Evaporator fan motor has off delay on units equipped with time delay relay of approximately 30 seconds on shutdown 3 When using an auto changeover room thermostat place both SYSTEM and FAN switches in AUTO positions Observe that unit operates in Heating mode when tem perature control is set to call for heating above room temperature and operates in Cooling mode when tem perature control is set to call for cooling below room temperature B Checking and Adjusting Refrigerant Charge The refrigerant system is fully charged with R 22 refriger ant and is tested and factory sealed NOTE Adjustment of the refrigerant charge is not required unless the unit is suspected
34. of not having the proper R 22 charge See Refrigerant Charge section on page 16 for fur ther details 2 19 1 C Unit Controls Compressor High Pressure Relief Valve Valve is located in compressor Relief valve opens at a pressure differential of approximately 450 psi between suction low side and discharge high side to allow pressure equalization Internal Current and Temperature Sensing Overload Device resets automatically when internal compressor motor temperature drops to a safe level When an internal overload is suspected of being open check by using an ohmmeter or continuity tester D Cooling Sequence of Operation NOTE With the FAN switch in the ON position 24 v is sup plied to the time delay relay TDR through the G terminal on the thermostat This voltage energizes the coil of the re lay dosing the normally open set of contacts which provide continuous power to the indoor evaporator fan motor Moving the FAN switch back to the AUTO position provid ingthereis not a call for cooling deenergizes the TDR when applicable which deenergizes the IFM after a 30 second de lay The FAN switch in AUTO position cycles upon a call for cooling On a call for cooling 24 v is supplied to the compressor con tactor C and TDR simultaneously through the Y and G ter minals of the thermostat respectively On units with a com pressor TDR thereis a built in 5 minute 45 seconds delay between compress
35. or starts Energizing the contactor closes the normally open set of contacts supplying power to both the compressor and outdoor condenser fan motor OFM Ener gizing the TDR doses the normally open set of contacts pro viding power to the IFM On the loss of the call for cooling 24 v is removed from both the Y and G terminals of the ther mostat providing the FAN switch is in the AUTO position deenergizing both the compressor and TDR and opening both the contacts supplying power to compressor and OFM IFM has a 30 second delay Ill INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS N CAUTION For cooling operation the recommended airflow is 350 to 450 cfm per each 12 000 Btuh of rated cooling capacity Table 3 shows dry coil air delivery for horizontal discharge units A WARNING Disconnect electrical power to the unit be fore changing blower speed Electrical shock can cause personal injury or death Airflow can be changed by changing the lead connections of the blower motor Units 564A 764A024 036 048 and 060 blower motors are factory wired for low speed operation Units 564A 764A030 and 042 are factory wired for medium speed operation Table 3 Dry Coil Air Delivery Horizontal Discharge POWER UNIT IFM SPEED AIRFLOW ESP 564A 764A SETTING Cfm in wg Watts 0 30 282 low 140 0 30 495 0 50 650 048 a ern 0 15 900 2000 0 60 850 2000 0 65 945 LEGEND ESP
36. passing through un conditioned space and use vapor barrier in accordance with latest issue of SMACNA Sheet Metal and Air Conditioning Contractors National Association and Air Conditioning Contractors of America minimum installation standards for heating and air conditioning systems Secure all ducts to building structure Flash weatherproof and vibration isolate all openings in building structure in accordance with local codes and good building practices Air filters should be installed in return air ductwork Return air filter grilleor filter tracks in duct may beused ESQ f STRAIGHT PIECE d Figure 12 shows a typical duct system with unit installed Fig 10 Installation of Duct Flanges Size 060 Only a INDOOR THERMOSTAT POWER AND LOW VOLTAGE ENTRY COMPOSITE RUST PROOF BASEPAN CONDENSATE DRAIN CONNECTION LEGEND NEC National Electrical Code o Power Wiring Control Wiring DISCONNECTS PER NEC UNIT AND LECTRIC HEATER 2 Outdoor Airflow Indoor Airflow Required for electric heater when single point connection is not used Fig 12 Typical Installation C Converting Horizontal Discharge Units to Downflow Vertical Discharge A WARNING Before performing service or mainte nance operations on system turn off main power to unit Turn off accessory heater power switch if applicable Elec trical shock can cause personal injury
37. pator must be adjusted prop erly to ensure proper heating performance Set antici pator settings for room thermostat according to separate Accessory Electric Heater Installation Instructions Failure to make a proper heat anticipator adjustment will result in improper operation discomfort to the occupants of the conditioned space and inefficient energy utilization how ever the required setting may be changed slightly to provide a greater degree of comfort for a particular installation E Accessory Installation At this time any required accessories should be installed on the unit Refer to separate accessory installation instructions PRE START UP A WARNING Failure to observe the following warn ings could result in serious personal injury 1 Follow recognized safety practices and wear protec tive goggles when checking or servicing refrigerant system 2 Do not operate compressor or provide any electric power to unit unless compressor terminal cover is in place and secured 3 Do not remove compressor terminal cover until all electrical sources have been disconnected 4 Relieve and reclaim all pressure from both high and low pressure sides of the system before touching or disturbing anything inside terminal box if refriger ant leak is suspected around compressor terminals 5 Never attempt to repair soldered connection while refrigerant system is under pressure 6 Do not use torch to remove any component Syst
38. r Evaporator Fan Motor LRA Locked Rotor Amps Minimum Circuit Amps MOCP Maximum Overcurrent Protection National Electrical Code OFM Outdoor Condenser Fan Motor RLA Rated Load Amps Heater capacity kW is based on heater voltage of 208 v 240 v or 480 v If power distribution voltage to unit varies from rated heater voltage heater kW will vary accordingly TFuse or HACR circuit breaker NOTES 1 In compliance with NEC requirements for multimotor and combination load and equipment refer to NEC Articles 430 and 440 the overcurrent protective de vice for the unit shall be fuse or HACR breaker 2 Unbalanced 3 Phase Supply Voltage Never operate a motor where a phase imbalance in supply voltage is greater than 2 Use the following formula to determine the percentage of voltage imbalance 96 Voltage Imbalance max voltage deviation from average voltage 100 x average voltage 10 32 3 3 8 5 0 18 1 20 8 32 3 7 5 10 0 36 1 41 7 50 4 11 3 15 0 54 2 62 5 72 9 15 0 20 0 72 2 83 3 95 5 109 4 E 3 8 5 0 10 4 12 0 7 5 10 0 20 8 24 1 11 3 15 0 31 3 36 1 15 0 20 0 41 7 48 1 3 8 5 0 10 4 12 0 7 5 10 0 20 8 24 1 11 3 15 0 31 3 36 1 15 0 20 0 41 7 48 1 EXAMPLE Supply voltage is 460 3 60 A 452 v BC 464 v AC 455v 452 464 455 Average voltage 3 457 Determine maximum
39. r death Warning indi cates a condition that could result in personal injury Caution is used to identify unsafe practices which would result in minor personal injury or product and property damage NWARNING Before performing service or main tenance operations on system turn off main power switches to unit Turn off accessory heater power switch if applicable Electric shock can cause personal injury 1 The power supply volts phase and hertz must corre spond to that specified on unit rating plate 2 The electrical supply provided by the utility must be suf ficient to handle load imposed by this unit 3 Refer to Installation Locate the Unit section page 5 and Fig 2 4 for locations of electrical inlets condensate drain duct connections and required clearances before setting unit in place 4 This installation must conform with local building codes and with NEC National Electrical Code or NFPA National Fire Protection Association 54 54 84 1 Refer to provincial and local plumbing or wastewater codes and other applicable local codes 5 Approved for outdoor installation on wood flooring or on class A B or C roof covering materials INSTALLATION All units can be connected into existing duct systems that are sized properly and designed to handle the airflow shown in theAir Delivery tableand Indoor Airflow and Airflow Adjust ments section NOTE When installing any accessory item see the manu facturer s in
40. sepan MAXIMUM ALLOWABLE DIFFERENCE in 6 VA Va Va Fig 5 Unit Leveling Tolerances REAR SIDE OF UNIT er mm 32 1 2 UNIT OUTLINE PAD SIDE OF UNIT WITH DUCT CONNECTIONS SIDE OF UNIT WITH CONDENSATE DRAIN AND WIRING KNOCKOUT HOLES NOTES 1 Extend a 24 in gravel apron around pad 2 Provide a 30 in service clearance at front and rear sides of unit Fig 6 Pad Dimensions UNIT DUCT AND FIELD CONNECTIONS A Condensate Disposal NOTE Ensure that condensate water disposal methods com ply with local codes restrictions and practices Units remove condensate water through a in ID hole lo cated on the control box side of the unit Condensate water be drained directly onto a gravel apron in ground level installations I nstall a field supplied conden sate trap at end of condensate connection to ensure proper drainage See Fig 7 Make sure that the outlet of the trap is at least 1 lower than the drain pan condensate connection to prevent the pan from overflowing See Fig 8A and 8B Prime the trap with water When using a gravel apron make sure it slopes away from the unit Table 1 Physical Data UNIT 564A AND 764A 0 030 06 042 048 9060 OPERATING WEIGHT COMPRESSOR TYPE REFRIGERANT Charge Ib 2 8 3 9 4 7 R 22 4 4 6 1 7 5 REFRIGERANT METERING DEVICE Acutrol System Copper Tubes Aluminum Plate Fins 17
41. stallation instructions packaged with the acces sory Use factory authorized kits or accessories when modifying this unit UNIT LEGEND UNIT ELECTRICAL WEIGHT CENTER OF GRAVITY mm in NEC National Electrical Code DPE pal acd nd de a zZ 1 Lb Kg REQUIRED CLEARANCES TO COMBUSTIBLE 024 208 230 1 60 355 6 14 00 508 0 20 00 241 3 9 50 Tore Uri mm 030 208 230 1 60 355 6 14 00 508 0 20 00 241 3 9 50 Duct Side of Unit 1 0 1 60 6114 Side Opposite Ducts 0 036 1 208 230 1 60 208 230 3 60 250 355 6 14 00 508 0 20 00 3 9 50 ale MARRE A 0 NEC REQUIRED CLEARANCES mm in Between Units Power Entry Side 1066 8 42 00 Unit and Ungrounded Surfaces Power Entry Side 914 0 36 00 Unit and Block or Concrete Walls and Other Grounded Surfaces Power Entry Side 1066 8 42 00 REQUIRED CLEARANCES FOR SERVICING mm in Condenser Coil Access Side 762 0 30 00 Power Entry Side Except for NEC Requirements 762 0 30 00 Unit Top 2 ae cet Sag be mme 914 0 36 00 Side Opposite 762 0 30 00 NOTES 1 Clearances must be maintained to prevent recirculation of air from condenser fan discharge With the exception of the condenser coil 914 mm 36 in a removable fence or bar ricade requires no clearance 2 Dimensions in
42. ure that refrigerant system pres sure has been relieved and recovered from both high and low pressure ports 2 Repair leak following accepted practices NOTE Install a filter drier whenever the system has been opened for repair 3 Add a small charge of nitrogen vapor to system leak test unit 4 Evacuate refrigerant system if additional leaks are not found 5 Charge unit with R 22 refrigerant using a volumetric charging cylinder or accurate scale Refer to unit rating plate for required charge Be sure to add extra refrig erant to compensate for internal volume of filter drier NOTE See Adjusting Refrigerant Charge on page 16 C Condenser Coil Evaporator Coil and Condensate Drain Pan A WARNING Be careful Coil fins are sharp Protect hands with gloves when cleaning or handling coil Inspect the condenser coil evaporator coil and condensate drain pan at least once each year Proper inspection and clean ing requires the removal of the unit top See Unit Top Removal section above The coils are easily cleaned when dry therefore inspect and dean the coils either before or after each cooling season Remove all obstructions including weeds and shrubs that interfere with the airflow through the condenser coil Straighten bent fins with a fin comb If coated with dirt or lint clean the coils with a vacuum cleaner using a soft brush attachment Be careful not to bend the fins If coated with oil or grease de
43. witch at AUTO or ON position Set heating temperature lever above room temperature 3 The evaporator fan and first stage heat will start im mediately If unit is equipped with 2 stage heaters second stage heat will energize upon a call from W2 Check for heating effect at supply diffusers 4 After the call for heat has been satisfied the evaporator fan will stop For units equipped with time delay relay evaporator fan will stop after a 30 second time delay To shut off unit set system selector switch at OFF position or set heating set point lever below room temperature B Heating Sequence of Operation When power is supplied to unit transformer TRAN is energized With thermostat set to call for heating sequence of operation is as follows On a call for heat circuit R W and R G are made through first stage thermostat bulb If accessory electric heaters are used a relay is energized bringing on first stage of supple mental electric heat and fan When thermostat is satisfied contacts open deenergizing relay on all units and time delay relay on units equipped with time delay relay Heat ers deenergize and evaporator fan stops after a 30 second time delay on units equipped with time delay relay Il COOLING SECTION START UP AND ADJUSTMENTS NCAUTION Complete the required procedures given in Pre Start U p section page 11 before starting theunit Do not jumper any safety devices when operating the unit D
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